diff options
Diffstat (limited to 'net/dsa/dsa2.c')
| -rw-r--r-- | net/dsa/dsa2.c | 654 |
1 files changed, 654 insertions, 0 deletions
diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c new file mode 100644 index 000000000000..80dfe08db825 --- /dev/null +++ b/net/dsa/dsa2.c @@ -0,0 +1,654 @@ +/* + * net/dsa/dsa2.c - Hardware switch handling, binding version 2 + * Copyright (c) 2008-2009 Marvell Semiconductor + * Copyright (c) 2013 Florian Fainelli <florian@openwrt.org> + * Copyright (c) 2016 Andrew Lunn <andrew@lunn.ch> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#include <linux/device.h> +#include <linux/err.h> +#include <linux/list.h> +#include <linux/slab.h> +#include <linux/rtnetlink.h> +#include <net/dsa.h> +#include <linux/of.h> +#include <linux/of_net.h> +#include "dsa_priv.h" + +static LIST_HEAD(dsa_switch_trees); +static DEFINE_MUTEX(dsa2_mutex); + +static struct dsa_switch_tree *dsa_get_dst(u32 tree) +{ + struct dsa_switch_tree *dst; + + list_for_each_entry(dst, &dsa_switch_trees, list) + if (dst->tree == tree) + return dst; + return NULL; +} + +static void dsa_free_dst(struct kref *ref) +{ + struct dsa_switch_tree *dst = container_of(ref, struct dsa_switch_tree, + refcount); + + list_del(&dst->list); + kfree(dst); +} + +static void dsa_put_dst(struct dsa_switch_tree *dst) +{ + kref_put(&dst->refcount, dsa_free_dst); +} + +static struct dsa_switch_tree *dsa_add_dst(u32 tree) +{ + struct dsa_switch_tree *dst; + + dst = kzalloc(sizeof(*dst), GFP_KERNEL); + if (!dst) + return NULL; + dst->tree = tree; + dst->cpu_switch = -1; + INIT_LIST_HEAD(&dst->list); + list_add_tail(&dsa_switch_trees, &dst->list); + kref_init(&dst->refcount); + + return dst; +} + +static void dsa_dst_add_ds(struct dsa_switch_tree *dst, + struct dsa_switch *ds, u32 index) +{ + kref_get(&dst->refcount); + dst->ds[index] = ds; +} + +static void dsa_dst_del_ds(struct dsa_switch_tree *dst, + struct dsa_switch *ds, u32 index) +{ + dst->ds[index] = NULL; + kref_put(&dst->refcount, dsa_free_dst); +} + +static bool dsa_port_is_dsa(struct device_node *port) +{ + const char *name; + + name = of_get_property(port, "label", NULL); + if (!name) + return false; + + if (!strcmp(name, "dsa")) + return true; + + return false; +} + +static bool dsa_port_is_cpu(struct device_node *port) +{ + const char *name; + + name = of_get_property(port, "label", NULL); + if (!name) + return false; + + if (!strcmp(name, "cpu")) + return true; + + return false; +} + +static bool dsa_ds_find_port(struct dsa_switch *ds, + struct device_node *port) +{ + u32 index; + + for (index = 0; index < DSA_MAX_PORTS; index++) + if (ds->ports[index].dn == port) + return true; + return false; +} + +static struct dsa_switch *dsa_dst_find_port(struct dsa_switch_tree *dst, + struct device_node *port) +{ + struct dsa_switch *ds; + u32 index; + + for (index = 0; index < DSA_MAX_SWITCHES; index++) { + ds = dst->ds[index]; + if (!ds) + continue; + + if (dsa_ds_find_port(ds, port)) + return ds; + } + + return NULL; +} + +static int dsa_port_complete(struct dsa_switch_tree *dst, + struct dsa_switch *src_ds, + struct device_node *port, + u32 src_port) +{ + struct device_node *link; + int index; + struct dsa_switch *dst_ds; + + for (index = 0;; index++) { + link = of_parse_phandle(port, "link", index); + if (!link) + break; + + dst_ds = dsa_dst_find_port(dst, link); + of_node_put(link); + + if (!dst_ds) + return 1; + + src_ds->rtable[dst_ds->index] = src_port; + } + + return 0; +} + +/* A switch is complete if all the DSA ports phandles point to ports + * known in the tree. A return value of 1 means the tree is not + * complete. This is not an error condition. A value of 0 is + * success. + */ +static int dsa_ds_complete(struct dsa_switch_tree *dst, struct dsa_switch *ds) +{ + struct device_node *port; + u32 index; + int err; + + for (index = 0; index < DSA_MAX_PORTS; index++) { + port = ds->ports[index].dn; + if (!port) + continue; + + if (!dsa_port_is_dsa(port)) + continue; + + err = dsa_port_complete(dst, ds, port, index); + if (err != 0) + return err; + + ds->dsa_port_mask |= BIT(index); + } + + return 0; +} + +/* A tree is complete if all the DSA ports phandles point to ports + * known in the tree. A return value of 1 means the tree is not + * complete. This is not an error condition. A value of 0 is + * success. + */ +static int dsa_dst_complete(struct dsa_switch_tree *dst) +{ + struct dsa_switch *ds; + u32 index; + int err; + + for (index = 0; index < DSA_MAX_SWITCHES; index++) { + ds = dst->ds[index]; + if (!ds) + continue; + + err = dsa_ds_complete(dst, ds); + if (err != 0) + return err; + } + + return 0; +} + +static int dsa_dsa_port_apply(struct device_node *port, u32 index, + struct dsa_switch *ds) +{ + int err; + + err = dsa_cpu_dsa_setup(ds, ds->dev, port, index); + if (err) { + dev_warn(ds->dev, "Failed to setup dsa port %d: %d\n", + index, err); + return err; + } + + return 0; +} + +static void dsa_dsa_port_unapply(struct device_node *port, u32 index, + struct dsa_switch *ds) +{ + dsa_cpu_dsa_destroy(port); +} + +static int dsa_cpu_port_apply(struct device_node *port, u32 index, + struct dsa_switch *ds) +{ + int err; + + err = dsa_cpu_dsa_setup(ds, ds->dev, port, index); + if (err) { + dev_warn(ds->dev, "Failed to setup cpu port %d: %d\n", + index, err); + return err; + } + + ds->cpu_port_mask |= BIT(index); + + return 0; +} + +static void dsa_cpu_port_unapply(struct device_node *port, u32 index, + struct dsa_switch *ds) +{ + dsa_cpu_dsa_destroy(port); + ds->cpu_port_mask &= ~BIT(index); + +} + +static int dsa_user_port_apply(struct device_node *port, u32 index, + struct dsa_switch *ds) +{ + const char *name; + int err; + + name = of_get_property(port, "label", NULL); + + err = dsa_slave_create(ds, ds->dev, index, name); + if (err) { + dev_warn(ds->dev, "Failed to create slave %d: %d\n", + index, err); + return err; + } + + return 0; +} + +static void dsa_user_port_unapply(struct device_node *port, u32 index, + struct dsa_switch *ds) +{ + if (ds->ports[index].netdev) { + dsa_slave_destroy(ds->ports[index].netdev); + ds->ports[index].netdev = NULL; + } +} + +static int dsa_ds_apply(struct dsa_switch_tree *dst, struct dsa_switch *ds) +{ + struct device_node *port; + u32 index; + int err; + + err = ds->drv->setup(ds); + if (err < 0) + return err; + + err = ds->drv->set_addr(ds, dst->master_netdev->dev_addr); + if (err < 0) + return err; + + err = ds->drv->set_addr(ds, dst->master_netdev->dev_addr); + if (err < 0) + return err; + + for (index = 0; index < DSA_MAX_PORTS; index++) { + port = ds->ports[index].dn; + if (!port) + continue; + + if (dsa_port_is_dsa(port)) { + err = dsa_dsa_port_apply(port, index, ds); + if (err) + return err; + continue; + } + + if (dsa_port_is_cpu(port)) { + err = dsa_cpu_port_apply(port, index, ds); + if (err) + return err; + continue; + } + + err = dsa_user_port_apply(port, index, ds); + if (err) + continue; + } + + return 0; +} + +static void dsa_ds_unapply(struct dsa_switch_tree *dst, struct dsa_switch *ds) +{ + struct device_node *port; + u32 index; + + for (index = 0; index < DSA_MAX_PORTS; index++) { + port = ds->ports[index].dn; + if (!port) + continue; + + if (dsa_port_is_dsa(port)) { + dsa_dsa_port_unapply(port, index, ds); + continue; + } + + if (dsa_port_is_cpu(port)) { + dsa_cpu_port_unapply(port, index, ds); + continue; + } + + dsa_user_port_unapply(port, index, ds); + } +} + +static int dsa_dst_apply(struct dsa_switch_tree *dst) +{ + struct dsa_switch *ds; + u32 index; + int err; + + for (index = 0; index < DSA_MAX_SWITCHES; index++) { + ds = dst->ds[index]; + if (!ds) + continue; + + err = dsa_ds_apply(dst, ds); + if (err) + return err; + } + + /* If we use a tagging format that doesn't have an ethertype + * field, make sure that all packets from this point on get + * sent to the tag format's receive function. + */ + wmb(); + dst->master_netdev->dsa_ptr = (void *)dst; + dst->applied = true; + + return 0; +} + +static void dsa_dst_unapply(struct dsa_switch_tree *dst) +{ + struct dsa_switch *ds; + u32 index; + + if (!dst->applied) + return; + + dst->master_netdev->dsa_ptr = NULL; + + /* If we used a tagging format that doesn't have an ethertype + * field, make sure that all packets from this point get sent + * without the tag and go through the regular receive path. + */ + wmb(); + + for (index = 0; index < DSA_MAX_SWITCHES; index++) { + ds = dst->ds[index]; + if (!ds) + continue; + + dsa_ds_unapply(dst, ds); + } + + pr_info("DSA: tree %d unapplied\n", dst->tree); + dst->applied = false; +} + +static int dsa_cpu_parse(struct device_node *port, u32 index, + struct dsa_switch_tree *dst, + struct dsa_switch *ds) +{ + struct net_device *ethernet_dev; + struct device_node *ethernet; + + ethernet = of_parse_phandle(port, "ethernet", 0); + if (!ethernet) + return -EINVAL; + + ethernet_dev = of_find_net_device_by_node(ethernet); + if (!ethernet_dev) + return -EPROBE_DEFER; + + if (!ds->master_netdev) + ds->master_netdev = ethernet_dev; + + if (!dst->master_netdev) + dst->master_netdev = ethernet_dev; + + if (dst->cpu_switch == -1) { + dst->cpu_switch = ds->index; + dst->cpu_port = index; + } + + dst->tag_ops = dsa_resolve_tag_protocol(ds->drv->tag_protocol); + if (IS_ERR(dst->tag_ops)) { + dev_warn(ds->dev, "No tagger for this switch\n"); + return PTR_ERR(dst->tag_ops); + } + + dst->rcv = dst->tag_ops->rcv; + + return 0; +} + +static int dsa_ds_parse(struct dsa_switch_tree *dst, struct dsa_switch *ds) +{ + struct device_node *port; + u32 index; + int err; + + for (index = 0; index < DSA_MAX_PORTS; index++) { + port = ds->ports[index].dn; + if (!port) + continue; + + if (dsa_port_is_cpu(port)) { + err = dsa_cpu_parse(port, index, dst, ds); + if (err) + return err; + } + } + + pr_info("DSA: switch %d %d parsed\n", dst->tree, ds->index); + + return 0; +} + +static int dsa_dst_parse(struct dsa_switch_tree *dst) +{ + struct dsa_switch *ds; + u32 index; + int err; + + for (index = 0; index < DSA_MAX_SWITCHES; index++) { + ds = dst->ds[index]; + if (!ds) + continue; + + err = dsa_ds_parse(dst, ds); + if (err) + return err; + } + + if (!dst->master_netdev) { + pr_warn("Tree has no master device\n"); + return -EINVAL; + } + + pr_info("DSA: tree %d parsed\n", dst->tree); + + return 0; +} + +static int dsa_parse_ports_dn(struct device_node *ports, struct dsa_switch *ds) +{ + struct device_node *port; + int err; + u32 reg; + + for_each_available_child_of_node(ports, port) { + err = of_property_read_u32(port, "reg", ®); + if (err) + return err; + + if (reg >= DSA_MAX_PORTS) + return -EINVAL; + + ds->ports[reg].dn = port; + } + + return 0; +} + +static int dsa_parse_member(struct device_node *np, u32 *tree, u32 *index) +{ + int err; + + *tree = *index = 0; + + err = of_property_read_u32_index(np, "dsa,member", 0, tree); + if (err) { + /* Does not exist, but it is optional */ + if (err == -EINVAL) + return 0; + return err; + } + + err = of_property_read_u32_index(np, "dsa,member", 1, index); + if (err) + return err; + + if (*index >= DSA_MAX_SWITCHES) + return -EINVAL; + + return 0; +} + +static struct device_node *dsa_get_ports(struct dsa_switch *ds, + struct device_node *np) +{ + struct device_node *ports; + + ports = of_get_child_by_name(np, "ports"); + if (!ports) { + dev_err(ds->dev, "no ports child node found\n"); + return ERR_PTR(-EINVAL); + } + + return ports; +} + +static int _dsa_register_switch(struct dsa_switch *ds, struct device_node *np) +{ + struct device_node *ports = dsa_get_ports(ds, np); + struct dsa_switch_tree *dst; + u32 tree, index; + int err; + + err = dsa_parse_member(np, &tree, &index); + if (err) + return err; + + if (IS_ERR(ports)) + return PTR_ERR(ports); + + err = dsa_parse_ports_dn(ports, ds); + if (err) + return err; + + dst = dsa_get_dst(tree); + if (!dst) { + dst = dsa_add_dst(tree); + if (!dst) + return -ENOMEM; + } + + if (dst->ds[index]) { + err = -EBUSY; + goto out; + } + + ds->dst = dst; + ds->index = index; + dsa_dst_add_ds(dst, ds, index); + + err = dsa_dst_complete(dst); + if (err < 0) + goto out_del_dst; + + if (err == 1) { + /* Not all switches registered yet */ + err = 0; + goto out; + } + + if (dst->applied) { + pr_info("DSA: Disjoint trees?\n"); + return -EINVAL; + } + + err = dsa_dst_parse(dst); + if (err) + goto out_del_dst; + + err = dsa_dst_apply(dst); + if (err) { + dsa_dst_unapply(dst); + goto out_del_dst; + } + + dsa_put_dst(dst); + return 0; + +out_del_dst: + dsa_dst_del_ds(dst, ds, ds->index); +out: + dsa_put_dst(dst); + + return err; +} + +int dsa_register_switch(struct dsa_switch *ds, struct device_node *np) +{ + int err; + + mutex_lock(&dsa2_mutex); + err = _dsa_register_switch(ds, np); + mutex_unlock(&dsa2_mutex); + + return err; +} +EXPORT_SYMBOL_GPL(dsa_register_switch); + +void _dsa_unregister_switch(struct dsa_switch *ds) +{ + struct dsa_switch_tree *dst = ds->dst; + + dsa_dst_unapply(dst); + + dsa_dst_del_ds(dst, ds, ds->index); +} + +void dsa_unregister_switch(struct dsa_switch *ds) +{ + mutex_lock(&dsa2_mutex); + _dsa_unregister_switch(ds); + mutex_unlock(&dsa2_mutex); +} +EXPORT_SYMBOL_GPL(dsa_unregister_switch); |